Excavator.



PATENTED JULY 14, 1903..

P. J. RAYMOND.

EXGAVATOR.

APPLIOATION FILED mm. 12, 1902.

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N0 MODEL.

IN VEN TOR M f Attorneys.

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me now No. 733,422. PATENTBD JULY 14, 1903.-

3. J. RAYMOND.

EXGAVATOR.

APPLICATION TILED MAR. 12. 1902.

N0 MODEL. 2 SHEETS-SHEET 2.

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NITED STATES Patented July 14,1903. '2

PROSPER J. RAYMOND, OF DETROIT, MICHIGAN.

EXCAVATO R.

SPECIFICATION forming part of Letters Patent No. 733,422, dated July 14,1903. Application filed March 12, 1902. Serial No. 97,897. (No model.)

To ctZZ whom it may concern:

Be it known that I, PROSPER J. RAYMOND,

a citizen of the United States, residing at Detroit, county of Wayne,State of Michigan, have invented a certain new and useful Improvement inExcavators; and I declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it pertains to make and use the same, reference being hadto the accompanying drawings, which form a part of this specification.

This invention relates to excavators, and has for its object an improvedexcavatingmachine intended to be drawn forward in the ditch from whichthe soil is excavated and to loosen and lift the dirt as it advances andprovided with various adjustments to regulate the depth of cut and theobliquity at which digging parts of the machine set.

In the drawings, Figure 1 is a side elevation of the excavating part ofthe machine. The carrier on which the machine is supported is not shownin this drawing. Fig. 2 is a detail of the device used to regulate thedepth of cut. Fig. 3 is a perspective detail of a part of the deviceregulating the depth of cut. Fig. 4: is a cross-section at the line a aof Fig. 1. Fig. 5 is a perspective of the elevator-bucket employed.

A indicates the main framework, on which the entire machine issupported. On the frame A is journaled a shaft 2, which carries a pairof sprocket-wheels, one of whichis seen at 3. On the shaft 2 is aswinging and hanging frame-bar 4, at the bottom end of which issupported a journal 5, thatcarries sprocketwheel 6. The upper end of theframe-bar at supports a journal 7, that carries sprocketwheels 8.Sprocket-wheels 8 and 6 are idlerwheels, or mere carrying-wheels for theupper and lower ends of an elevating sprocketchain 9, that is driven bythe sprocket-wheel 3 on the shaft 2 from any convenient source of power.The sprocket-chains are in a pair, and they support buckets 10, whichare secured by pins or rivets 11 to suitable links of thesprocket-chains, and each bucket has the material of which it iscomposed bent back from the outer edge and extending obliquely inwardtoward the chain. The bent-back portion 21 forms a brace to aid insupporting the bucket, and it also forms a guide or slide to directmaterial dropping from the overturned bucket (as shown at the top ofFig. 1) into a .carrier 13, which removes the material. The

sprocket-chain also carries at intervals rows of digging-knives 14, thepoints of which project beyond the normal line of travel of the bucketsand are arranged to cut into and loosen the soil, causing it to fallinto the buckets 10.

The frame-bar 4, which hangs on the shaft 2, is provided with a longslot 15, that engages over a guide-pin 16 in a block 17. The block 17 ismovable along the frame-bar A. To enable it to have such movement, theframe-bar A supports a parallel bar B, spaced from it, and the block 17is fitted between the bars A and B and arranged to slide along the barA.

On the vertical frame-bar 4 is a rack 18, thatengages a pinion 19. Thepinion is on a shaft 20, journaled in the sliding block 17. The end ofthe shaft 20 is provided with a hand-winch 28 and with a ratchet-wheel22, with which engages a pawl 23. By turning the winch 21 and the shaft20 the pinion 19 is actuated and the depth of the hanger-bar 4 and thesprocket-chain and the buckets supported by it regulated at will withinthe limits of the machine.

The obliquity of the hanger 4t and of the excavating apparatus isregulated by a handguide 24, made in the form of a bail, extending fromone endof the journal 5 to the other end thereof, and this bail isemployed by the workman to shift forward or backward the lower end ofthe hanger, shifting the block 17 and regulating the amount of theforward cut in accordance with the requirements of the soil or of thedifficulties of the work. It also enables the workman to quicklywithdraw the cutting part of the apparatus should it meet an obstructionliable to injure the machineas, for example, should a boulder beencountered the workman can immediately withdraw or cease to advance themachine and prevent any injury resulting to it.

The entire excavating-machine is supported on and projects from the rearpart of an ordinary traction-engine, and it has not been thoughtnecessary to show the support, as it forms no part of the invention.

30 indicates an apron-board which prevents dirt from dropping from theelevator into the bottom of the machine behind the sprocket- Wheel 6.

\Vhat I claim is 1. In an excavator of the kind employing sprocketwheels and chains, a bucket secured to the chain at its advance portionand provided with a rearwardly extending brace adapted to contact thechain, when the bucket is upon the straight portion of the chain.

2. In an excavator, the combination of a framework, a slotted hanger, ajournal on the framework passing through said slot, ahorizontally-movable block carrying a pinion, a rack on said hanger toengage said pinion, a pin passing through the slot and the block,whereby the hanger may be given a verticallyreciprocating movement andthe block a horizontally-reciprocating movement, substantially asdescribed.

3. In an excavator of the kind employing sprocket wheels and chains, abucket formed of sheet metal bent to form its outer edges, the metalextending in one direction from said bend to form the receptacle 0f thebucket and extending in the other direction to form a brace.

In testimony whereof I sign this specification in the presence of twowitnesses.

PROSPER J. RAYMOND.

Witnesses:

MAY E. Kerr, CHARLES F. BURTON.

